The ways around that are to build a business around supporting their voucher and inspection program and spending no small amount of effort ensuring they are smoothly servicing your rentals. 

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

From my research, it seems that the best way is to ensure the end buyer's funds are at title in escrow (with the clear to close) before you approve the release of your funds.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

You want to make sure they are properly installed and you don't want tenants moving large appliances in and out of the house as it will cause damage. 

Work with them to ensure they feel comfortable with you as the new property owner.

There needs to be someone similar to Always Marco on Youtube with the MLMs where you have someone exposing gurus who sell ******** courses.If you want to legitimately learn wholesaling, stop wasting money on ******** courses, and pay for such things as hiring an attorney to properly set up contracts, hire people to do inspections and appraisals, and hire CPAs to make sure that your business operates properly.

So, if you put in 20K, you could set the bid up to the amount of the 100K total debt(80K existing + 20K additional) to ensure that the property reverts to you as the lender.

Get an attorney and get these losers out then hire a property manager to properly vet any future tenants! 

If they're delinquent after only 2 months, they're either facing sudden life changes or you did not properly screen them to begin with.